Descriptions Obagi C-Rx System C-Clarifying Serum is the first & only prescription strength 4% Hydroquinone and Vitamin C Serum. Obagi C-Rx System C-Clarifying Serum penetrates deep into the skins dermal layers, where it enhances collagen productions and reduces melanosome activity and tyrosinase activation, making skin photoluminous.
Product Ingredients Hydroquinone 4%, Propylene Glycol, Propylene Carbonate, L-Ascorbic Acid (Vitamin C), Purified Water and Sodium Lauryl Sulfate Suggested Use Use Obagi C-Rx System C-Clarifying Serum in the morning (AM) and in the evening (PM). Note Obagi System skin care products are prescription strength, or pharmaceutical quality products that work at the cellular level to improve the skin cell function. It is important to contact your Physician or Skin Care Specialist prior to use and purchase. Weight 1 fl oz/ 30ml